We use the AWI aircraft Polar 5 for boundary layer measurements in polar regions. The main instruments used include

- the turbulence sensor package
- the noseboom
- the radiation sensors
- and downward looking cameras.

The turbulence probe measures the angles of attack and sideslip, as well as pitot and static pressures. Fast temperature and humidity sensors are also included. Together with the aircraft's inertial platform and gps positioning the three dimensional wind vector can be determined. Vertical turbulent fluxes of heat, moisture, and momentum are derived from these measurements.

The radiation sensors are shortwave (solar spectrum) and longwave (terrestrial spectrum) broadband hemispheric sensors upward and downward looking. Furthermore, upward looking sensors measure short wave radiation in spectral resolution for some selected wavelengths.